Constant-temperature sand core mold

Abstract

The utility model relates to a constant-temperature sand core mold which comprises an upper mold base and a lower mold base, a forming cavity used for forming a sand core is formed in the lower mold base, a forming assembly used for assisting sand core forming is arranged in the forming cavity, a plurality of through grooves are formed in the lower mold base and evenly distributed in the width direction of the lower mold base at equal intervals, and a heating pipe is arranged in each through groove; the sand core is cured in the forming cavity through the heating pipe, the cured sand core has high strength and hardness, and the risk that the sand core is damaged in the taking-out process is reduced. The device has the effect of improving the quality of the sand core.

Description

Technical Field

[0001] The present application relates to the field of mold technology, and in particular to a constant temperature sand core mold. Background Art

[0002] Sand casting is a type of casting process. It first uses molding sand and core sand as molding materials to make a mold and a core. Then, liquid metal is allowed to fill the cavity between the mold and the core under its own gravity or external pressure. After the metal solidifies, the mold and core are broken to remove the workpiece. Currently, the core is usually made using a sand core mold.

[0003] There is a sand core, such as Figure 1 As shown, it includes a horizontally arranged circular ring disk, a sand core rod is provided on the outer side wall of the circular ring disk, the sand core rod is integrally formed with the circular ring disk at one end facing the circular ring disk, the sand core rod is arranged around the circular ring disk at one end facing the circular ring disk, the sand core rod is inclined downward at one end facing away from the circular ring disk, and a positioning block is provided on the side wall of the sand core rod at one end facing away from the circular ring disk.

[0004] However, the conventional sand core forming method is to use a sand core mold to press the sand core into shape, take the sand core out of the mold after forming, and then bake it in an oven. However, since the sand core rod is arranged around the ring disk at one end facing the ring disk and is formed integrally with the ring disk, when the sand core is taken out from the sand core mold, the sand core rod fits tightly against the mold cavity wall. At the same time, the strength of the uncured sand core is low. During the removal process, the sand core rod may be easily broken due to gravity or friction, thereby reducing the quality of the sand core, which is obviously insufficient. Utility Model Content

[0005] In order to improve the quality of sand cores, the present application provides a constant temperature sand core mold.

[0006] The constant temperature sand core mold provided in this application adopts the following technical solution:

[0007] A constant temperature sand core mold includes an upper mold base and a lower mold base. The lower mold base is provided with a molding cavity for molding sand cores. A molding assembly for assisting in molding the sand cores is provided in the molding cavity. The lower mold base is provided with multiple through slots, and the multiple through slots are evenly distributed along the width direction of the lower mold base. A heating tube is provided in each through slot.

[0008] By adopting the technical scheme, when the mold works, the upper die holder and the lower die holder are in contact and closed to complete the clamping, and a cavity for molding a sand core is formed under the common enclosure of the molding cavity and the molding assembly. At this time, the molding sand is injected to form the sand core. After the sand core is molded, the heating pipe is started, and the heat generated by the heating pipe is transmitted to the sand core along the lower die holder to keep the solidification temperature of the sand core constant. After the sand core is solidified in the molding cavity, the sand core is taken out. Meanwhile, the uniformly distributed heating pipes make the heat more uniformly transmitted to the sand core, which ensures the solidification effect of the sand core. The sand core is thus solidified in the molding cavity. The solidified sand core has high strength and hardness, and the risk of damage to the sand core in the taking-out process is reduced, thereby improving the quality of the sand core.

[0009] Optionally, the lower die holder is provided with a first sliding groove and a second sliding groove which are in communication with the molding cavity. The molding assembly comprises a first molding block which is slidingly connected in the first sliding groove. The second sliding groove is slidingly connected with a second molding block. The first molding block, the second molding block and the inner side wall of the molding cavity are collectively used for molding the sand core.

[0010] By adopting the technical scheme, when the sand core is molded, the first molding block moves to abut against the molding cavity, and the second molding block moves to abut against the end of the second sliding groove which is close to the molding cavity. At this time, the molding cavity, the first molding block and the second molding block enclose a cavity for molding the sand core, and the molding process of the sand core is realized.

[0011] Optionally, the lower die holder is provided with a first guide seat and a second guide seat. The first molding block is slidingly connected in the first guide seat, and the second molding block is slidingly connected in the second guide seat. The first guide seat and the second guide seat are provided with a driving assembly. The driving assembly in the first guide seat drives the first molding block to reciprocate along the first sliding groove. The driving assembly drives the second molding block to reciprocate along the second sliding groove.

[0012] By adopting the technical scheme, after the solidification of the sand core is completed, the driving assembly is started. The driving assembly drives the first molding block to move away from the molding cavity, and drives the second molding block to move away from the molding cavity. At this time, the first molding block and the second molding block are both separated from the molded sand core, so that a gap is left between the sand core and the lower die holder, and the constraint between the sand core and the lower die holder is released, so that the sand core can be smoothly separated from the lower die holder, avoiding quality problems caused by close contact. After the sand core is taken out, the driving assembly drives the first molding block to abut against the molding cavity, and drives the second molding block to abut against the end of the second sliding groove which is close to the molding cavity, so as to continue to mold the next sand core.

[0013] Optionally, the driving assembly comprises a first cylinder and a second cylinder, an output shaft of the first cylinder is arranged on the first forming block, and an output shaft of the second cylinder is arranged on the second forming block.

[0014] By adopting the technical scheme, the first cylinder and the second cylinder serve as a power source, have the advantages of stable output force and adjustable speed, and can accurately control the moving speed and position of the first forming block and the second forming block, so that the first forming block and the second forming block can move more accurately in the sand core forming and demolding processes, and the forming quality of the sand core and the working efficiency of the mold are further improved.

[0015] Optionally, the outer surface of each heating pipe is provided with a plurality of heat conduction assemblies, the plurality of heat conduction assemblies are equidistantly and uniformly distributed along the length direction of the heating pipe, the heat conduction assembly comprises a plurality of heat conduction protrusions, the plurality of heat conduction protrusions are equidistantly and uniformly distributed on the outer circumferential side of the heating pipe, the outer surface of the heating pipe is provided with a groove in sliding fit with the heat conduction protrusion, a pressing spring is arranged in the groove, one end of the pressing spring is arranged on the bottom wall in the groove, and the other end of the pressing spring is arranged on the heat conduction protrusion; when the heat conduction protrusion abuts against the inner side wall of the through groove, the pressing spring is in a compressed state, and the pressing spring and the heat conduction protrusion are both made of metal.

[0016] By adopting the technical scheme, when there is a gap between the heating pipe and the inner side wall of the through groove after the heating pipe is installed inside the through groove, the pressing spring pops out the heat conduction protrusion in the groove, the heat conduction protrusion abuts against the inner side wall of the through groove, at this time, heat is transmitted to the inner side wall of the through groove under the heat conduction of the pressing spring and the heat conduction protrusion, the heat conduction efficiency is improved, the possibility of heat conduction efficiency reduction due to the gap is avoided, and thus the heat generated by the heating pipe is transmitted to the lower mold base more quickly, and the temperature uniformity of the sand core forming environment is ensured.

[0017] Optionally, the outer surface of each heating pipe is rotatably sleeved with a connecting sleeve, the connecting sleeve is provided with an avoiding groove corresponding to each heat conduction protrusion; when the connecting sleeve covers the heat conduction protrusion, the pressing spring is in a compressed state, and the connecting sleeve is made of metal.

[0018] By adopting the technical scheme, when the heating pipe needs to be installed, the connecting sleeve is rotated to cover the heat conduction protrusion, at this time, the heat conduction protrusion is retracted into the groove, the pressing spring is compressed under pressure, and thus the worker can smoothly insert the heating pipe into the inside of the through groove; after the heating pipe is mostly inserted into the inside of the through groove, the connecting sleeve is rotated again to rotate the heat conduction protrusion below the connecting sleeve to the avoiding groove, at this time, the pressing spring pops out the heat conduction protrusion and abuts against the inner side wall of the through groove, and the setting of the connecting sleeve avoids the situation that the heat conduction protrusion causes the heating pipe to be not smoothly installed, and the installation efficiency of the heating pipe is improved.

[0019] Optionally, the driving assembly comprises a first inclined block and a second inclined block arranged on the upper die seat, the end of the first forming block is provided with a first connecting block, the end of the second forming block is provided with a second connecting block, the first connecting block is in sliding fit with the inclined surface of the first inclined block, the second connecting block is in sliding fit with the inclined surface of the second inclined block, the first guide seat and the second guide seat are respectively provided with a first spring and a second spring, the first spring connects the side wall of the first guide seat and the first forming block, the second spring connects the side wall of the second guide seat and the second forming block, in the natural state of the first spring and the second spring, the first forming block and the second forming block are separated from the sand core.

[0020] By adopting the above technical scheme, when the mold is closed, the upper die seat moves towards the lower die seat, the movement of the upper die seat makes the first connecting block abut against the inclined surface of the first inclined block and the second connecting block abut against the inclined surface of the second inclined block, then the upper die seat continues to move downwards, the first inclined block and the second inclined block respectively push the first forming block and the second forming block to move towards the forming cavity, when the mold is completely closed, the first forming block moves to abut against the forming cavity and the second forming block moves to abut against the end of the second sliding groove close to the forming cavity, at this time, the cavity of the sand core is enclosed; when the mold is opened, the upper die seat moves upwards and gradually moves away from the lower die seat, when the upper die seat is separated from the lower die seat, the first connecting block and the second connecting block are respectively separated from the first inclined block and the second inclined block, at this time, the pushing force received by the first spring and the second spring disappears, the first spring and the second spring reset to drive the first forming block and the second forming block to separate from the sand core, so that the first forming block and the second forming block are driven to move by the action of opening and closing the mold, the use of additional power equipment is reduced, the cost of the mold is reduced, and stable sand core forming and demolding operations can also be realized.

[0021] Optionally, the first forming block and the second forming block are both made of alumina ceramic material.

[0022] By adopting the above technical scheme, the alumina ceramic material is a wear-resistant and high-temperature-resistant material, which can withstand the friction and pressure of the sand core material during the forming process of the sand core, reduce the defects on the surface of the sand core, and can work stably in the high-temperature environment required for the solidification of the sand core. It will not react with the binder and additives in the sand core material, avoiding the pollution of the forming block material and affecting the quality of the sand core.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. This application provides a heating tube. After the sand core is formed, the heating tube is turned on. The heat generated by the heating tube is transferred to the sand core along the lower mold base, so that the curing temperature of the sand core is kept constant. After the sand core is cured in the molding cavity, it is removed. At the same time, the evenly distributed heating tubes allow the heat to be more evenly transferred to the sand core, ensuring the curing effect of the sand core. This arrangement realizes the curing of the sand core in the molding cavity. The cured sand core has higher strength and hardness, reduces the risk of damage to the sand core during removal, and thus improves the quality of the sand core.

[0025] 2. The present application provides a drive assembly, a first molding block, and a second molding block. After the sand core is cured, the drive assembly is started, and the drive assembly drives the first molding block to move in a direction away from the molding cavity, and the drive assembly drives the second molding block to move in a direction away from the molding cavity. At this time, the first molding block and the second molding block are both separated from the formed sand core, so that a gap is left between the sand core and the lower mold base, and the constraint between the sand core and the lower mold base is released, so that the sand core can be smoothly separated from the lower mold base, avoiding quality problems caused by close contact;

[0026] 3. The present application sets up a heat-conducting component. When there is a gap between the heating tube and the inner wall of the through groove, the holding spring pops out the heat-conducting protrusion inside the groove, and the heat-conducting protrusion abuts against the inner wall of the through groove. At this time, the heat is transferred to the inner wall of the through groove under the heat conduction of the holding spring and the heat-conducting protrusion, thereby improving the efficiency of heat conduction and avoiding the possibility of a decrease in heat conduction efficiency due to the existence of the gap, so that the heat generated by the heating tube is transferred to the lower mold base more quickly, thereby ensuring the temperature uniformity of the sand core molding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural diagram of the sand core in the background technology of this application.

[0028] Figure 2 It is a structural diagram of Example 1 in this application.

[0029] Figure 3 It is a structural schematic diagram of the lower mold base in Example 1 of the present application.

[0030] Figure 4 It is a cross-sectional view of the second chute in Example 1 of the present application.

[0031] Figure 5 It is a cross-sectional view of the through groove in Example 2 of the present application.

[0032] Figure 6 This Figure 5 Enlarged view of point A in the middle.

[0033] Figure 7 It is a structural diagram of the heating tube and the connecting sleeve in Example 2 of the present application.

[0034] Figure 8 is a structure diagram of the first inclined block and the first spring in the third embodiment of the present application.

[0035] Figure 9 is a structure diagram of the second inclined block and the second spring in the third embodiment of the present application.

[0036] Legend: 00, sand core; 001, circular ring disc; 002, sand core rod; 003, positioning block; 01, upper die seat; 02, lower die seat; 1, forming cavity; 2, forming assembly; 21, first forming block; 22, second forming block; 3, first sliding groove; 4, second sliding groove; 5, through groove; 6, heating pipe; 61, groove; 7, first guide seat; 8, second guide seat; 9, driving assembly; 91, first air cylinder; 92, second air cylinder; 93, first inclined block; 94, second inclined block; 95, first connecting block; 96, second connecting block; 97, first spring; 98, second spring; 10, heat conduction assembly; 101, heat conduction protrusion; 102, abutting spring; 11, connecting sleeve; 111, avoiding groove. DETAILED DESCRIPTION

[0037] The following will be described in detail with reference to the accompanying drawings. Figures 1-9 The present application is further described in detail.

[0038] The present application discloses a constant-temperature sand core mold.

[0039] Embodiment 1

[0040] With reference to Figures 1 to 4 , a constant-temperature sand core mold includes an upper die seat 01 and a lower die seat 02, the lower die seat 02 is provided with a forming cavity 1 for forming a sand core 00, and a forming assembly 2 for assisting the forming of the sand core 00 is arranged in the forming cavity 1. Specifically, the forming assembly 2 includes a first forming block 21 and a second forming block 22, both of which are made of high-temperature-resistant aluminum oxide ceramic material. The lower die seat 02 is provided with a first sliding groove 3 and a second sliding groove 4 in communication with the forming cavity 1, the first forming block 21 is slidingly connected in the first sliding groove 3, and the second forming block 22 is slidingly connected in the second sliding groove 4. The first forming block 21 and the second forming block 22 are both provided with forming curved surfaces for forming the rod of the sand core 00, and the first forming block 21, the second forming block 22 and the inner side wall of the forming cavity 1 are used together to form the sand core 00.

[0041] With reference to Figure 2 , a plurality of through grooves 5 are provided in the lower die seat 02, and the plurality of through grooves 5 are evenly distributed along the width direction of the lower die seat 02. A heating pipe 6 is installed in each through groove 5.

[0042] With reference to Figure 3 and Figure 4, the first guide seat 7 and the second guide seat 8 are detachably connected on the lower die seat 02 through connecting bolts, the axis of the first guide seat 7 is in the same straight line with the axis of the first sliding groove 3, the axis of the second guide seat 8 is in the same straight line with the axis of the second sliding groove 4, the first forming block 21 is in sliding fit with the first guide seat 7, the second forming block 22 is in sliding fit with the second guide seat 8, the first guide seat 7 and the second guide seat 8 are provided with a driving assembly 9, specifically, the driving assembly 9 comprises a first air cylinder 91 and a second air cylinder 92, the first air cylinder 91 is fixedly installed in the first guide seat 7, the output shaft of the first air cylinder 91 is fixedly connected on the first forming block 21, the second air cylinder 92 is fixedly installed in the second guide seat 8, the output shaft of the second air cylinder 92 extends to the inside of the second sliding groove 4 and is fixedly connected with the second forming block 22.

[0043] The implementation principle of the constant-temperature sand core mold in the embodiment of the application is as follows: when the mold works, the upper die seat 01 and the lower die seat 02 are in contact and closed to complete the clamping, then the first air cylinder 91 pushes the first forming block 21 to move to abut against the forming cavity 1, the second forming block 22 moves to abut against the end of the second sliding groove 4 close to the forming cavity 1, at this time, the forming cavity 1, the first forming block 21 and the second forming block 22 enclose a cavity for forming the sand core 00, the worker fills the molding sand through the injection port to form the sand core 00, after the sand core 00 is formed, the heating pipe 6 is started, the heat generated by the heating pipe 6 is transmitted to the sand core 00 along the lower die seat 02, so that the solidification temperature of the sand core 00 is kept constant, after the sand core 00 is solidified in the forming cavity 1, the first air cylinder 91 drives the first forming block 21 to move towards the direction away from the forming cavity 1, the second air cylinder 92 drives the second forming block 22 to move towards the direction away from the forming cavity 1, the first forming block 21 and the second forming block 22 are both separated from the formed sand core 00, finally the upper die seat 01 is separated from the lower die seat 02, and the worker takes out the solidified sand core 00 from the forming cavity 1;

[0044] The above arrangement realizes the solidification of the sand core 00 in the forming cavity 1, the solidified sand core 00 has high strength and hardness, the risk of damage of the sand core 00 in the taking-out process is reduced, thereby the quality of the sand core 00 is improved, meanwhile, the first forming block 21 and the second forming block 22 are driven by the driving assembly 9 to separate from the sand core 00, so that the gap is left between the sand core 00 and the lower die seat 02, the constraint between the sand core 00 and the lower die seat 02 is released, the quality problem caused by close contact is avoided, and the quality of the sand core 00 is further improved.

[0045] Embodiment 2

[0046] Reference Figure 5 and Figure 6, the difference between embodiment 2 and embodiment 1 is that a plurality of heat conduction components 10 are arranged on the outer surface of each heating pipe 6, and the plurality of heat conduction components 10 are uniformly distributed along the length direction of the heating pipe 6, specifically, the heat conduction component 10 includes a plurality of heat conduction protrusions 101, the plurality of heat conduction protrusions 101 are uniformly distributed on the outer circumferential side of the heating pipe 6, a groove 61 corresponding to the plurality of heat conduction protrusions 101 is arranged on the outer surface of the heating pipe 6, the heat conduction protrusion 101 is slidingly connected inside the corresponding groove 61, a pressing spring 102 is arranged inside the groove 61, one end of the pressing spring 102 is fixedly connected to the inner bottom wall of the groove 61, and the other end is fixedly connected to the heat conduction protrusion 101, when the heat conduction protrusion 101 abuts against the inner side wall of the through groove 5, the pressing spring 102 pushes the heat conduction protrusion 101 to move away from the groove 61, when the heat conduction protrusion 101 abuts against the inner side wall of the through groove 5, the pressing spring 102 is in a compressed state, and the pressing spring 102 and the heat conduction protrusion 101 are both made of metal.

[0047] Referring to Figure 6 and Figure 7 each heat conduction pipe is rotatably connected with a connecting sleeve 11, the connecting sleeve 11 is sleeved on the outer surface of the heat conduction pipe, the connecting sleeve 11 is made of metal material, and the connecting sleeve 11 is provided with an avoiding groove 111 corresponding to the plurality of heat conduction protrusions 101, when the connecting sleeve 11 covers the plurality of heat conduction protrusions 101, the pressing spring 102 is in a compressed state.

[0048] The implementation principle of embodiment 2 is that when the heating pipe 6 needs to be installed, the connecting sleeve 11 is rotated to cover the heat conduction protrusion 101, at this time the pressing spring 102 is compressed, the heat conduction protrusion 101 is embedded in the groove 61, then the worker inserts the heating pipe 6 into the through groove 5;

[0049] If there is a gap between the outer side wall of the heating pipe 6 and the inner side wall of the through groove 5 after the heating pipe 6 is inserted into the through groove 5, then the worker rotates the connecting sleeve 11 again to make the heat conduction protrusion 101 below the connecting sleeve 11 rotate to the avoiding groove 111, the pressure on the pressing spring 102 disappears, the pressing spring 102 resets to pop out the heat conduction protrusion 101 and abut against the inner side wall of the through groove 5, at this time the heat is transmitted to the inner side wall of the through groove 5 under the heat conduction of the connecting sleeve 11, the pressing spring 102 and the heat conduction protrusion 101, which improves the heat conduction efficiency and avoids the possibility of reducing the heat conduction efficiency due to the existence of the gap, so that the heat generated by the heating pipe 6 is transmitted to the lower mold base 02 more quickly, thereby ensuring the temperature uniformity of the sand core 00 forming environment.

[0050] Embodiment 3

[0051] Referring to Figure 8 and Figure 9, embodiment 3 is different from embodiment 1, the driving assembly 9 comprises a first inclined block 93 and a second inclined block 94 fixedly connected to the bottom surface of the upper die seat 01, the end of the first forming block 21 is fixedly connected with a first connecting block 95, the end of the second forming block 22 is fixedly connected with a second connecting block 96, the first connecting block 95 is in sliding fit with the inclined surface of the first inclined block 93 along the inclined direction of the first inclined block 93, the second connecting block 96 is in sliding fit with the inclined surface of the second inclined block 94 along the inclined direction of the second inclined block 94, the first guide seat 7 and the second guide seat 8 are respectively provided with a first spring 97 and a second spring 98, the first spring 97 connects the side wall of the first guide seat 7 and the first forming block 21, the second spring 98 connects the side wall of the second guide seat 8 and the second connecting block 96, in the natural state of the first spring 97 and the second spring 98, the first forming block 21 and the second forming block 22 are separated from the sand core 00.

[0052] The implementation principle of the constant-temperature sand core mold in the embodiment of the application is as follows: when the mold is closed, the upper die seat 01 moves towards the lower die seat 02, the movement of the upper die seat 01 causes the first connecting block 95 to abut against the inclined surface of the first inclined block 93 and the second connecting block 96 to abut against the inclined surface of the second inclined block 94, then the upper die seat 01 continues to move downwards, the first inclined block 93 and the second inclined block 94 respectively push the first forming block 21 and the second forming block 22 to move towards the forming cavity 1, when the mold is completely closed, the first forming block 21 moves to abut against the forming cavity 1 and the second forming block 22 moves to abut against the end of the second sliding groove 4 close to the forming cavity 1, at this time, the cavity of the sand core 00 is formed; when the mold is opened, the upper die seat 01 moves upwards and gradually moves away from the lower die seat 02, when the upper die seat 01 is separated from the lower die seat 02, the first connecting block 95 and the second connecting block 96 are respectively separated from the first inclined block 93 and the second inclined block 94, at this time, the pushing force on the first spring 97 and the second spring 98 disappears, the first spring 97 and the second spring 98 reset to drive the first forming block 21 and the second forming block 22 to separate from the sand core 00, in this way, the movement of the first forming block 21 and the second forming block 22 is driven by the action of mold opening and closing, the use of additional power equipment is reduced, the mold cost is reduced, and stable sand core 00 forming and demolding operations can also be realized.

[0053] The above are preferred embodiments of the application, which do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A constant temperature sand core mold comprising an upper mold base (01) and a lower mold base (02), characterized in that, The lower mold base (02) is provided with a forming cavity (1) for forming a sand core (00), and a forming assembly (2) for assisting the forming of the sand core (00) is arranged in the forming cavity (1). A plurality of through grooves (5) are arranged in the lower mold base (02) and are uniformly distributed along the width direction of the lower mold base (02). A heating pipe (6) is arranged in each through groove (5).

2. A thermostatic sand mold according to claim 1, wherein The lower mold base (02) is provided with a first sliding groove (3) and a second sliding groove (4) which are in communication with the forming cavity (1). The forming assembly (2) comprises a first forming block (21) which is slidingly connected in the first sliding groove (3), and a second forming block (22) which is slidingly connected in the second sliding groove (4). The first forming block (21), the second forming block (22) and the inner side wall of the forming cavity (1) are used together for forming a sand core (00).

3. A thermostatic sand mold according to claim 2, wherein The lower mold base (02) is provided with a first guide seat (7) and a second guide seat (8). The first forming block (21) is slidingly connected in the first guide seat (7), and the second forming block (22) is slidingly connected in the second guide seat (8). A driving assembly (9) is arranged in the first guide seat (7) and the second guide seat (8). The driving assembly (9) in the first guide seat (7) drives the first forming block (21) to reciprocate along the first sliding groove (3), and the driving assembly (9) drives the second forming block (22) to reciprocate along the second sliding groove (4).

4. A thermostatic sand mold according to claim 3, wherein The driving assembly (9) comprises a first air cylinder (91) and a second air cylinder (92). The output shaft of the first air cylinder (91) is arranged on the first forming block (21), and the output shaft of the second air cylinder (92) is arranged on the second forming block (22).

5. A constant temperature sand mold according to claim 1, wherein A plurality of heat conduction assemblies (10) are arranged on the outer surface of each heating pipe (6) and are uniformly distributed along the length direction of the heating pipe (6). The heat conduction assembly (10) comprises a plurality of heat conduction protrusions (101) which are uniformly distributed on the outer circumferential side of the heating pipe (6). A groove (61) is arranged on the outer surface of the heating pipe (6) and is in sliding cooperation with the heat conduction protrusion (101). A pressing spring (102) is arranged in the groove (61). One end of the pressing spring (102) is arranged on the bottom wall of the groove (61), and the other end is arranged on the heat conduction protrusion (101). When the heat conduction protrusion (101) abuts against the inner side wall of the through groove (5), the pressing spring (102) is in a compressed state. The pressing spring (102) and the heat conduction protrusion (101) are both made of metal.

6. A thermostatic sand moulding flask according to claim 5, wherein Each outer surface of the heating pipe (6) is rotationally sleeved with a connecting sleeve (11), the connecting sleeve (11) is provided with an avoiding slot (111) corresponding to the plurality of heat-conducting protrusions (101), when the connecting sleeve (11) covers the heat-conducting protrusions (101), the abutting spring (102) is in a compressed state, and the connecting sleeve (11) is made of metal material.

7. A constant temperature sand mold according to claim 3, wherein The driving assembly (9) comprises a first inclined block (93) and a second inclined block (94) arranged on the upper die seat (01), the end of the first forming block (21) is provided with a first connecting block (95), the end of the second forming block (22) is provided with a second connecting block (96), the first connecting block (95) is in sliding fit with the inclined surface of the first inclined block (93), the second connecting block (96) is in sliding fit with the inclined surface of the second inclined block (94), the first guide seat (7) and the second guide seat (8) are respectively provided with a first spring (97) and a second spring (98), the first spring (97) is connected with the side wall of the first guide seat (7) and the first forming block (21), the second spring (98) is connected with the side wall of the second guide seat (8) and the second connecting block (96), and the first forming block (21) and the second forming block (22) are separated from the sand core (00) in the natural state of the first spring (97) and the second spring (98).

8. A thermostatic sand mold according to claim 1, wherein The first forming block (21) and the second forming block (22) are made of alumina ceramic material.

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